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Citi Logo Citi · IT - Software Development

Application Developer Senior UI Programmer

Japan, Tokyo · Job Posted April 16, 2026
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Job Description

An application Developer Senior UI Programmer is responsible for designing, developing, testing, implementing, and maintaining complex user interface applications, ensuring an optimal user experience, performance, and scalability. This role will be the primary expert for UI development within the team, working closely with global backend developers.

Job Responsibility

  • Lead the technical vision and architecture for all user interfaces, ensuring responsiveness, accessibility, performance, and scalability
  • Define UI technical specifications, component structures, and interaction models, especially in the context of refactoring existing new application and establishing new patterns
  • Evaluate and recommend new UI frameworks, libraries, tools, and approaches to improve front-end development processes and application performance
  • Drive the establishment and adherence to a consistent design system and best practices across the application's user interface
  • Proactively identify areas for architectural improvement and reusability within existing UI codebases
  • Lead the development of complex UI modules and features using established front-end programming languages, frameworks, and libraries
  • Take ownership of refactoring existing UI programs, transforming them into modular, maintainable, and highly reusable components
  • Write clean, efficient, well-documented, and maintainable code for the user interface
  • Develop and integrate front-end components with APIs, ensuring efficient data fetching and state management
  • Optimize UI for maximum speed and scalability across various devices and browsers
  • Implement pixel-perfect designs and ensure cross-browser compatibility
  • Design, develop, and execute comprehensive unit, integration, and end-to-end tests for UI components and applications
  • Implement and promote automated UI testing strategies within the front-end development pipeline
  • Perform visual regression testing and ensure adherence to accessibility standards
  • Diagnose and resolve complex technical issues, bugs, and performance bottlenecks in UI applications across production and development environments
  • Provide expert-level support for user interface applications
  • Participate in on-call rotations or provide support during off-hours as required for UI systems
  • Act as the subject matter expert for UI development, providing guidance and setting standards for front-end best practices
  • Lead UI development initiatives, overseeing task allocation and progress
  • Share knowledge and expertise through presentations, documentation, and informal coaching
  • Work closely with UX/UI designers to translate wireframes and mockups into functional user interfaces
  • Collaborate extensively with global backend developer team members to ensure seamless integration
  • Communicate complex technical UI concepts effectively to non-technical audiences and other developers

Requirements

  • 5-10 years of progressive experience in front-end and UI development, with a significant portion in a senior or lead capacity
  • Expertise in JavaScript and TypeScript
  • Proficiency in HTML and CSS, including modern CSS techniques (e.g., Flexbox, Grid, pre-processors like SASS/LESS) for responsive and maintainable styling
  • Solid experience with React.js (preferred)
  • Strong proficiency in other modern UI frameworks (e.g., Angular, Vue.js)
  • Experience with ag-Grid is valued
  • Experience with libraries and techniques for efficiently rendering and managing large datasets (e.g., advanced data grid components, virtualization, lazy loading, data streaming)
  • Proficiency in developing and integrating front-end components with APIs
  • Understanding of efficient data fetching, state management techniques, and integration with cache servers, and data streaming solutions with data distribution
  • Skills in optimizing UI for maximum speed, responsiveness, and scalability across various devices and browsers
  • Ability to implement pixel-perfect designs
  • Ensuring cross-browser compatibility
  • Writing clean, efficient, well-documented, and maintainable code
  • Adherence to coding standards and best practices for front-end development
  • Strong understanding and implementation experience with entitlement management, role-based access control (RBAC), and user permissions within UI applications
  • Ability to securely display, restrict, and manage user interactions based on their authorized entitlements
  • Primary responsibility for leading the technical vision and architecture for all user interfaces, including defining user experience (UX) patterns, interaction models, and UI technical specifications
  • Proficiency in ensuring responsiveness, accessibility, performance, and scalability in UI design
  • Strong capability in refactoring existing UI programs into modular, maintainable, and highly reusable components
  • Proactive identification of architectural improvements and reusability opportunities
  • Responsible for evaluating and recommending new UI frameworks, libraries, tools, and approaches
  • Driving the establishment and adherence to a consistent design system and best practices
  • Design, development, and execution of comprehensive unit, integration, and end-to-end tests for UI components and applications
  • Implementation and promotion of automated UI testing strategies (e.g., Jest, React Testing Library, Cypress, Selenium)
  • Proficiency with testing frameworks like Jest, React Testing Library
  • Experience with end-to-end testing tools such as Cypress, Selenium
  • Performance of visual regression testing
  • Ensuring adherence to accessibility standards
  • Ability to diagnose and resolve complex technical issues, bugs, and performance bottlenecks in UI applications
  • Providing expert-level support for user interface applications
  • Acting as the definitive subject matter expert for UI development, including user experience (UX) considerations
  • Leading UI development initiatives
  • Sharing knowledge and expertise through presentations, documentation, and informal coaching
  • Proactively gather user requirements and define optimal user interaction flows
  • Collaborate extensively with global backend developer team members
  • Exceptional ability to communicate complex technical UI/UX concepts effectively to non-technical audiences, other developers, and architects
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